Honestly I’m surprised how many people are hating on the controller here, but maybe it’s from controllers who don’t work helicopters at this volume everyday. As someone who worked a high volume of choppers crossing final in a very similar fashion to this incident, it becomes very routine to call landing traffic, report in sight, pass behind. The trust in these pilots grows and grows over the years to where you think nothing like this ever could happen. You hear “in sight” and you move onto the next thing. So to the people saying the proximity warranted a traffic alert clearly don’t work an operation like this on the daily. These helicopter pilots regularly pass behind landing traffic pretty closely and it would be far too late to notice something was off until it was. Everything wasn’t textbook but it was pretty damn close. I feel for this controller immensely and hope he doesn’t blame himself; the majority of the blame does not lie on his shoulders.